package com.boot.common.encrypt;

import org.apache.commons.codec.binary.Base64;

import javax.crypto.Cipher;
import java.security.*;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.HashMap;
import java.util.Map;

/**
 * 非对称性加密工具类
 * @author mkq
 *
 */
public class RSAEncrypt {
	public final static String public_key = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDlFEuPCmJA8WWbGnImo1hLPAHMiSN/7cUOjcNoVOSrpbfbAMPxvTlN0Oo5Kk+cGFeQtWm+Wxe+2pBNcenbKqV/TtPBGXGq9lBS1eTSaBhKIwQy/8j5ucj7KW4ICv9ObFRiPbfTIg7IeBJhprjDbzxc+/1/Fw29M8AINowOmX+PFwIDAQAB";
	public final static String private_key = "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";
	
	private static Map<Integer, String> keyMap = new HashMap<Integer, String>();  //用于封装随机产生的公钥与私钥
	public static void main(String[] args) throws Exception {
		//生成公钥和私钥
//		genKeyPair();
		//加密字符串
		String message = "张三123";
//		System.out.println("随机生成的公钥为:" + keyMap.get(0));
//		System.out.println("随机生成的私钥为:" + keyMap.get(1));
//		String messageEn = encrypt(message,keyMap.get(0));
		String messageEn = encrypt(message,public_key);
		System.out.println(message + "\t加密后的字符串为:" + messageEn);
		String messageDe = decrypt(messageEn,private_key);
		System.out.println("还原后的字符串为:" + messageDe);
		
		String message1 = "15075132545";
//		System.out.println("随机生成的公钥为:" + keyMap.get(0));
//		System.out.println("随机生成的私钥为:" + keyMap.get(1));
//		String messageEn = encrypt(message,keyMap.get(0));
		String messageEn1 = encrypt(message1,public_key);
		System.out.println(message1 + "\t加密后的字符串为:" + messageEn1);
		String messageDe1 = decrypt(messageEn1,private_key);
		System.out.println("还原后的字符串为:" + messageDe1);
	}

	/** 
	 * 随机生成密钥对 
	 * @throws NoSuchAlgorithmException 
	 */  
	public static void genKeyPair() throws NoSuchAlgorithmException {  
		// KeyPairGenerator类用于生成公钥和私钥对，基于RSA算法生成对象  
		KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA");  
		// 初始化密钥对生成器，密钥大小为96-1024位  
		keyPairGen.initialize(1024,new SecureRandom());  
		// 生成一个密钥对，保存在keyPair中  
		KeyPair keyPair = keyPairGen.generateKeyPair();  
		RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();   // 得到私钥  
		RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();  // 得到公钥  
		String publicKeyString = new String(Base64.encodeBase64(publicKey.getEncoded()));
		// 得到私钥字符串  
		String privateKeyString = new String(Base64.encodeBase64((privateKey.getEncoded())));
		// 将公钥和私钥保存到Map
		keyMap.put(0,publicKeyString);  //0表示公钥
		keyMap.put(1,privateKeyString);  //1表示私钥
	}  
	/** 
	 * RSA公钥加密 
	 *  
	 * @param str 
	 *            加密字符串
	 * @param publicKey 
	 *            公钥 
	 * @return 密文 
	 * @throws Exception 
	 *             加密过程中的异常信息 
	 */  
	public static String encrypt( String str, String publicKey ) throws Exception{
		//base64编码的公钥
		byte[] decoded = Base64.decodeBase64(publicKey);
		RSAPublicKey pubKey = (RSAPublicKey) KeyFactory.getInstance("RSA").generatePublic(new X509EncodedKeySpec(decoded));
		//RSA加密
		Cipher cipher = Cipher.getInstance("RSA");
		cipher.init(Cipher.ENCRYPT_MODE, pubKey);
		String outStr = Base64.encodeBase64String(cipher.doFinal(str.getBytes("UTF-8")));
		return outStr;
	}

	/** 
	 * RSA私钥解密
	 *  
	 * @param str 
	 *            加密字符串
	 * @param privateKey 
	 *            私钥 
	 * @return 铭文
	 * @throws Exception 
	 *             解密过程中的异常信息 
	 */  
	public static String decrypt(String str, String privateKey) {
		//64位解码加密后的字符串
		byte[] inputByte;
		try {
			inputByte = Base64.decodeBase64(str.getBytes("UTF-8"));
			//base64编码的私钥
			byte[] decoded = Base64.decodeBase64(privateKey);
	        RSAPrivateKey priKey = (RSAPrivateKey) KeyFactory.getInstance("RSA").generatePrivate(new PKCS8EncodedKeySpec(decoded));  
			//RSA解密
			Cipher cipher = Cipher.getInstance("RSA");
			cipher.init(Cipher.DECRYPT_MODE, priKey);
			String outStr = new String(cipher.doFinal(inputByte));
			return outStr;
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return null;
		
	}

}
